[According to ‘makeuptip.com’, directly copy-pasted]
Applying lipliner is not only a great way to define and accentuate the shape of your lips, but also to keep your lipstick from feathering.
1. Begin applyling lipliner at the center of your natural upper lip line to define the bow then work toward the outer corners to complete the line.
2. Start at one corner of your bottom lip then follow your natural lip line all the way to the other corner.
Tip: Choose a lipliner that matches your lipstick or a flesh tone shade for a soft, natural look.
Tip: To get plumper, pinker looking lips, do not touch up by drawing a hard lip line; smudge it so lips look fuller! For a more dramatic fullness, choose a lipstick shade with a hint of frost.
Tip: To avoid lipstick on your teeth, put your index finger in your mouth and then draw it out slowly with your mouth closed. What you see on your finger is what would have ended up on your teeth!